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A Basis Theorem for 2-rigs and Rig Geometry
(Centre National de la Recherche Scientifique. Faculté des Sciences. Laboratoire amiénois de mathématique fondamentale et appliquée, 2021-10)
Un semi-anneau unitaire commutatif (ou rig, en abrégé) est integral si 1 + x = 1. Nous montrons que, de meme que le classique ‘gros topos’ de Zariski associé a un corps algébriquement clos, le topos classifiant Z des rigs ...
Anti-Kählerian geometry on Lie groups
(Springer, 2018-03-06)
Let G be a Lie group of even dimension and let (g,J) be a left invariant anti-Kähler structure on G. In this article we study anti-Kähler structures considering the distinguished cases where the complex structure J is ...
Refractive index effect in the lattice geometry of photonic crystals generated by multi-exposure interference patterns
(Iop Publishing LtdBristolInglaterra, 2009)
Compact manifolds of nonnegative isotropic curvature and pure curvature tensor
(Balkan Soc GeometersBucharestRoménia, 2005)
Evaluation of a mixed geometry model for the characterization of activated carbons
(Springer, 2011-01)
The predictions of the Pure Slit Geometry Model (PSGM) and the Mixed Geometry Model (MGM) for the characterization of activated carbons (AC) are compared and tested against the behavior of the textural properties of ...
Questões de uma olimpíada de matemática: um recurso para a sala de aula
(Universidade Tecnológica Federal do ParanáLondrinaBrasilEducação Matemática e CiênciasUTFPR, 2017-04-30)
The objective of this study is to compare the contents of a test of the first phase of the Brazilian Mathematics Olympiad of Public Schools (OBMEP), conducted by the National Institute of Pure and Applied Mathematics (IMPA), ...
On the geometry of generalized inverses
(Wiley VCH Verlag, 2005-04)
We study the set S = {(a, b) ∈ A × A : aba = a, bab = b} which pairs the relatively regular elements of aBanach algebra A with their pseudoinverses, and prove that it is an analytic submanifold of A × A. If A is a C∗-algebra, ...
The non-pure version of the simplex and the boundary of the simplex
(Elsevier Science, 2016-08)
We introduce the non-pure versions of simplicial balls and spheres with minimum number of vertices. These are a special type of non-homogeneous balls and spheres (NH-balls and NH-spheres) satisfying a minimality condition ...